This is one of those "eye of the beholder" deals. It is not a real stat. Its a flawed and has more to do with the judgement of the QB than accuracy. In fact, in one segment of this video clip, Dak chose to throw the ball in a tight window to witten b/c he flat out missed a wide open Rod Smith coming out of the backfield. Dak throws in a lot of tight windows b/c he's locking onto guys and not seeing the whole field.
Just look at this list. No Brady, Brees, or Rodgers? I can't take a stat seriously that is missing all 3 of those guys.